Why don't clothing web sites list dimensions of garments?

I started buying some new clothes a couple months ago, and the amount of stuff I have to buy and then return is insane. Buying a belt in 32, 34, and 36 because i have no idea how it measures, and then returning 2 of them. It would take an employee almost no time to measure and post dimensions of a season of clothing. WHY doesn't anyone do this? I have to go to eBay -- yes, eBay -- to find someone selling outlet finds to try to find actual measurements. it's crazy. All I need is a few key dimensions and then I have some idea if one of the sizes, if any, is going to fit me. It's especially difficult being short, because length becomes a factor. Your T-shirt is 34" long? ok, save me the trouble of buying a small and medium and returning both. ugh.